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Allows users to use AWS Glue Data Catalog as metastore in Hive connector
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presto-hive/src/main/java/com/facebook/presto/hive/metastore/glue/GlueExpressionUtil.java
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| /* | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package com.facebook.presto.hive.metastore.glue; | ||
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|
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| import com.amazonaws.services.glue.model.GetPartitionsRequest; | ||
| import com.facebook.presto.hive.HiveType; | ||
| import com.facebook.presto.hive.metastore.Column; | ||
| import com.facebook.presto.spi.PrestoException; | ||
| import com.google.common.base.Joiner; | ||
| import com.google.common.base.Strings; | ||
| import com.google.common.collect.ImmutableSet; | ||
|
|
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| import java.util.LinkedList; | ||
| import java.util.List; | ||
| import java.util.Set; | ||
|
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| import static com.facebook.presto.hive.HiveErrorCode.HIVE_METASTORE_ERROR; | ||
|
|
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| public class GlueExpressionUtil | ||
| { | ||
| private static final Joiner JOINER = Joiner.on(" AND "); | ||
| private static final Set<String> QUOTED_TYPES = ImmutableSet.of("string", "char", "varchar", "date", "timestamp", "binary", "varbinary"); | ||
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| private GlueExpressionUtil() {} | ||
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| /** | ||
| * <pre> | ||
| * Build an expression string used for partition filtering in {@link GetPartitionsRequest} | ||
| * | ||
| * Ex: partition keys: ['a', 'b'] | ||
| * partition values: ['1', '2'] | ||
| * expression: (a='1') AND (b='2') | ||
| * | ||
| * Partial specification ex: | ||
| * partition values: ['', '2'] | ||
| * expression: (b='2') | ||
| * </pre> | ||
| * @param partitionKeys | ||
| * @param partitionValues Full or partial list of partition values to filter on. Keys without filter should be empty string. | ||
| */ | ||
| public static String buildExpression(List<Column> partitionKeys, List<String> partitionValues) | ||
| { | ||
| if (partitionValues == null || partitionValues.isEmpty()) { | ||
| return null; | ||
| } | ||
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| if (partitionKeys == null || partitionValues.size() != partitionKeys.size()) { | ||
| throw new PrestoException(HIVE_METASTORE_ERROR, "Incorrect number of partition values: " + partitionValues); | ||
| } | ||
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| List<String> predicates = new LinkedList<>(); | ||
| for (int i = 0; i < partitionValues.size(); i++) { | ||
| if (!Strings.isNullOrEmpty(partitionValues.get(i))) { | ||
| predicates.add(buildPredicate(partitionKeys.get(i), partitionValues.get(i))); | ||
| } | ||
| } | ||
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| return JOINER.join(predicates); | ||
| } | ||
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| private static String buildPredicate(Column partitionKey, String value) | ||
| { | ||
| if (isQuotedType(partitionKey.getType())) { | ||
| return String.format("(%s='%s')", partitionKey.getName(), value); | ||
| } | ||
| return String.format("(%s=%s)", partitionKey.getName(), value); | ||
| } | ||
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| private static boolean isQuotedType(HiveType type) | ||
| { | ||
| return QUOTED_TYPES.contains(type.getTypeSignature().getBase()); | ||
| } | ||
| } |
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